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NULL值在API中怎么是负数

在DolphinDB GUI中v列(数据类型是double)显示空值如下:
image.png
但在JAVA API中显示了负数:
image.png
这是哪里有问题吗?


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DolphinDB使用Double类型的最小值来表示NULL值,并不是用NaN来表示的。其他类型也类似,比如CHAR类型用最小的char值-128表示NULL值。


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